:root {
  --main-color: #3498db;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
#app,
html,
body {
  min-height: 100%;
  min-width: 100%;
}

.flex {
  display: flex;
  justify-content: center;
  align-items: center;
}
